Furnace casing and front



H. L. WOOD.

FURNACE CASING AND FRONT.

Z a I MM W H mad 4% a. W m z a W w um APPLICATION FILED JUNE 25. I920.

I @QWWiMMMWMW attmmu o HARRY L. WOOD, OF DOVJAGIAC, .MICHIGAN 'ASSIGN OB TO PREMIER AIR HEATER COMPANY, OF DOWAGIAC, MICHIGAN, A CORPORATION OF MICHIGAN.

suitivaon oasiive AND FRONT.

i ,eionea Specification of Letters Patent. I Patqjflt gd fiigmg as, i922.

Application filed June 25,1920. Serial no; 391,764.

To all whom it may concern.

Be it known that I, HARRY L. lVoon, a citizen of the United States of America, residing at Dowagiac, in the county of Cass and State of Michigan, have invented certain new and useful Improvements in a Furnace Casing and Front, of which the following is a specification, reference being bad therein to the accompanying drawings.

This invention relates to expansion joints for furnaces. It particularly relates to furnaces-having cast iron frontportions and formed of sheet metal in their other portions. i

It is the object of the inventionto provide a joint between two portions of a furnace wall formed of materials diiferentially responsive to variations of temperature, as for example, cast iron and sheet metal, which joint will provide for differential expansion, and which will furthermore, provide a fastening between certain sections comprising said adjoining portionsp A preferred embodiment of the invention is illustrated in the accompanying drawing, wherein:

Figure l is a fragmentary perspective view of a portion of a furnace improved in accordance with this invention.

Figure 2 is a detail interior view of the improved joint. 4

Figure 3 is a horizontal sectional View of the same, the section being taken upon the line 3-3 of Figure 2.

Figure 4 is a vertical sectional view taken upon line 4t of Figure 2.

In these views the reference characters A and B respectively designate upper and lower cast metal sections, forming the front portion of a furnace, said sections abutting as indicated at C and being formed with adjoining fianges D interiorly of the furnace, which flanges may be connected in any suitable manner.

The cast metal front of the furnace is formed in two sections A and B, partly to facilitate the casting and assembling operations, and partly to decrease the danger of cracking or breaking, due to expansion and contraction stresses, which stresses may more readily be taken care of in the sec tional construction. Adjoining the cast iron parts A and B is a sheet metal wall comprising the upper and lower sections E and F respectively, the joint .therebetween being E and'F as indicatedat I.

in substantial alignment Witlllhfit' between the cast sections A and B. The sections E and F are connected by a band G formed of steel or some other suitable metal considerably'heavier in cross-section than said mem bers E and F and formed with a rib H which projects outwardly between said sections, as

is best seen in Figure t. At suitable intervals the connecting band is riveted or otherwise secured to the sheet metal sections The cast sections A and B are similarly formed upon their interior surfaces with .lugis 3?, adjacent theirabutting edges G, which lugs are in'vertical registration when said sections are connected and adapted for engagement by a cotter pin, or the like, as is indicated at K. A strip of sheet metal L is return-bent substantially midway of its ends, as indicated in Figure3, to permit its end portions to embrace an end portion of the band G, the outermost end portion of said strip L'being slotted as indicated'at L to accommodate the rib H. At its return-bend,

said strip L is shaped to form a sleeve M adapted to embrace the cotter pin K intermediate the lugs J. The end portions of the strip L are secured to the band G by rivets L or other suitable fastenings. clearance is provided between the sleeve M and the lugs J to more than provide for differential expansion between the cast iron and the sheet metal parts.

From the foregoing description it will be seen that the cast metal and the sheet metal parts are maintained by the described joint in proper overlapping relation without creating any hindrance to a differential response by members to variations in temperature. Furthermore, the cotter pin K forms an auxiliary connection between the upper and lower cast metal sections A. and B and the metal strip L forms a similar connection between the upper and lower sections E and F.. Thus the adjoining cast metal and sheet metal parts are maintained by the described joint in proper relation and at the same time the joint constitutes a reinforcement for the sections comprising said adjoining members.

What I claim as my invention is: j

1. In a furnace the combination with a cast metal front plate formed of upper and lower sections, a sheet metal casing formed of upper and .lower sections, aniron ring between said sheet metal sections and pin Sufiicient and loop joints connecting the ends of said 7 ring with-the front plate.

'tial expansion or contraction between the aforesaid sections.

3. In a furnace the combination with a front cast metal plate formed of upper and lower sections and a sheet metal casing formed of upper and lower sections, of a a pair of spaced lugs interiorly projecting from said plate, a pin'mounted in said lugs parallel to the adjoining edges of said plate and casing and a metal strip intermediately return bent having its end'portionsisecured to said casing and forming a sleeve at the return bend, embracing said pin.

4. In a furnace the combination with a cast metal front plate formed of upper and lower sections and a sheet metal casing formed of upper and lower sections, an iron ring adapted to fit between and secure said sheet metal sections, looped members secured to the ends of said ring and lugs upon the cast metal plate provided with a :pin adapted to engage said loop member to form a jointtherebetween.

5. In a furnace, the combination with a cast metal front plate composed of upper and lower sections, lugs upon each of said sectionsin direct alignment with eachother, a sheet metal casing formed of upper and lower sections, an iron ring extending between and forming a joint with said sheet metal'sections and provided at its ends with a looped portion, and a pin insertable through said lugs and looped portions form ing an attachment for said casing ring and acting to align said front sections, said joint permitting expansion "and maintaining alignment upon expansion.

. r 6. In a furnace, the combination of a cast metal front plate formed of upper and lower sections, a sheet metal casing composed of upper and lower sections, a ring forming a joint with said sheet metal sections,and joints connecting the ends ofsaid ringfivith said front plate andacting to-align said front plate sections, said jointsfper'mitting expansion between the plate sections and acting to maintain alignment of said front plate sections upon expansion.

7. In a furnace,the combination of a cast metal front plate, of a sheet metal casing composed of superposed sections, a ring forming a joint with said sheet metal secof said ring to said front plate, said sections permitting of differential vertical expansion between the sheet metal sections and the front plate.

Itions, and connections for securing the ends In testimony whereof I afiix my signature.

HARRY L. WOOD. 

